#define k_SCREEN_WIDTH				960
#define k_SCREEN_HEIGHT				640
#define k_DEVICE_WIDTH				1024
#define k_DEVICE_HEIGHT				600

#define ORIENTATION_INVALID				(-1)
#define ORIENTATION_PORTRAIT			(1 << 0)
#define ORIENTATION_LANDSCAPE_90		(1 << 1)
#define ORIENTATION_LANDSCAPE_270		(1 << 2)

#define ORIENTATION_DEFAULT				ORIENTATION_LANDSCAPE_270